Tasmota using PCF8574

[Sequenzial]

I2C device "PCF8574" is working generally, all Ports are configured as output:

• power1-7 work fine
• power8 has no function (on the console I see the change, but the relais is not responding)
• power0 acting on all relais (1-7 - not 8)
  so Relais 8 cannot be triggered.

Tried on 6.7.1 and currently running dev. 7.0.0.1

• [x] Searched the problem in issues
• [x] Searched the problem in the wiki
• [x] Searched the problem in the forum
• [x] Searched the problem in the chat
• [x] Device used (e.g., Sonoff Basic): wemos D1 mini
• [x] Tasmota binary firmware version number used: 7.0.0.1
  
  
  
  • [x] Self-compiled
  
  
  • [x] IDE / Compiler used: Arduino 1.8.10 / esp8266 V2.3.0
  
  
• [x ] Flashing tools used: Arduino 1.8.10
• [x] Provide the output of command: Backlog Template; Module; GPIO:

16:30:19 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/RESULT = {"NAME":"Generic","GPIO":[255,255,255,255,255,255,255,255,255,255,255,255,255],"FLAG":15,"BASE":18} 16:30:19 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/RESULT = {"Module":{"18":"Generic"}} 16:30:19 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/RESULT = {"GPIO0":{"0":"None"},"GPIO1":{"0":"None"},"GPIO2":{"0":"None"},"GPIO3":{"0":"None"},"GPIO4":{"0":"None"},"GPIO5":{"0":"None"},"GPIO12":{"5":"I2C SCL"},"GPIO13":{"0":"None"},"GPIO14":{"6":"I2C SDA"},"GPIO15":{"0":"None"},"GPIO16":{"0":"None"}}
Configuration output here:

• [x] Provide the output of this command: Status 0:
  STATUS 0 output here:

6 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS = {"Status":{"Module":18,"FriendlyName":["ESP-RELAIS-8X-01","ESP-RELAIS-8X-012","ESP-RELAIS-8X-013","ESP-RELAIS-8X-014"],"Topic":"ESP-RELAIS-8X-01","ButtonTopic":"0","Power":0,"PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":0,"SensorRetain":0,"PowerRetain":0}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS1 = {"StatusPRM":{"Baudrate":115200,"GroupTopic":"tasmotas","OtaUrl":"http://192.168.1.1/sonoff.bin","RestartReason":"Software/System restart","Uptime":"0T00:15:58","StartupUTC":"2019-10-27T15:16:38","Sleep":50,"CfgHolder":4617,"BootCount":7,"SaveCount":50,"SaveAddress":"3FA000"}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS2 = {"StatusFWR":{"Version":"7.0.0.1(tasmota)","BuildDateTime":"2019.10.27 16:11:47","Boot":31,"Core":"2_4_1","SDK":"2.2.1(cfd48f3)"}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS3 = {"StatusLOG":{"SerialLog":2,"WebLog":2,"MqttLog":0,"SysLog":0,"LogHost":"192.168.1.1","LogPort":514,"SSId":["WLAN","WLAN2"],"TelePeriod":300,"Resolution":"558180C0","SetOption":["00008009","2805C8000100060000005A00000000000000","80000000"]}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS4 = {"StatusMEM":{"ProgramSize":446,"Free":2624,"Heap":9,"ProgramFlashSize":4096,"FlashSize":4096,"FlashChipId":"164020","FlashMode":2,"Features":["00000407","0F002186","000083A0","00000085","000000C0","00000200"],"Drivers":"1,2,3,4,9,10,16,28","Sensors":"1,2,3,6"}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS5 = {"StatusNET":{"Hostname":"ESP-RELAIS-8X-01","IPAddress":"192.168.3.111","Gateway":"192.168.1.250","Subnetmask":"255.255.252.0","DNSServer":"192.168.1.3","Mac":"EC:00:00:00:D8:31","Webserver":2,"WifiConfig":4}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS6 = {"StatusMQT":{"MqttHost":"192.168.1.197","MqttPort":1883,"MqttClientMask":"ESP-RELAIS-8X-01","MqttClient":"ESP-RELAIS-8X-01","MqttUser":"USER","MqttCount":1,"MAX_PACKET_SIZE":1000,"KEEPALIVE":30}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS7 = {"StatusTIM":{"UTC":"Sun Oct 27 15:32:36 2019","Local":"Sun Oct 27 16:32:36 2019","StartDST":"Sun Mar 31 02:00:00 2019","EndDST":"Sun Oct 27 03:00:00 2019","Timezone":"+01:00","Sunrise":"07:10","Sunset":"17:09"}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS10 = {"StatusSNS":{"Time":"2019-10-27T16:32:36"}} 16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS11 = {"StatusSTS":{"Time":"2019-10-27T16:32:36","Uptime":"0T00:15:58","UptimeSec":958,"Heap":9,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":1,"POWER1":"OFF","POWER2":"OFF","POWER3":"OFF","POWER4":"OFF","POWER5":"OFF","POWER6":"OFF","POWER7":"OFF","POWER8":"OFF","Wifi":{"AP":1,"SSId":"WLAN","BSSId":"E0:00:00:00:83:DE","Channel":12,"RSSI":70,"LinkCount":1,"Downtime":"0T00:00:09"}}}

would be great to have all 8 Relais working!

Thanks in common!

BR
Seq

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[Jason2866]

This core is NOT supported
16:32:36 MQT: SmartHome/Garten/stat/ESP-RELAIS-8X-01/STATUS2 = {"StatusFWR":{"Version":"7.0.0.1(tasmota)","BuildDateTime":"2019.10.27 16:11:47","Boot":31,"Core":"2_4_1","SDK":"2.2.1(cfd48f3)"}}
Please compile with Core Pre 2.6. See wiki how to use in Arduino IDE https://github.com/arendst/Tasmota/wiki/Arduino-IDE

[andrethomas]

Have you tried power0 ?

[Sequenzial]

Yes, power0 switches all (1-7) relais, except 8.
... and yes the relais is ok ;-)

I´ll try compiling with vsc -> pre 2.6.

[Sequenzial]

Ok, I have compiled the firmware using Visual Studio Code with Core PRE 2.6
Now all 8 relais work fine.

Thanks for the support!

BR
Seq

[yogesh102011]

if i am using it as input instead of output.. how to know the status of the pin. thanks in advance

[yogesh102011]

if i make all 8 as output..its working fine with relay. but one problem i am facing is if all the 8 relays are on.. while restarting none of the relay is in onstate. but in web interface it show all are on. if i off one relay all are getting on except the one which is off

[ITTV-tools]

How did you set the PCF8574 up ? I can see it with i2cscan. But I found nothing in the docs and can not control it.

[Sequenzial]

When you got a firmware with PCF8574 integrated (no in these you can download), you have to set SDC and SDA to the correct GPIOS (those they are connected to).

When everything is correct, you will get an extra option under settings:

where you can define if the ports are IN- or OUT-Put (for each):

That´s it. The Output ports are shown as regular ports:

Inputs I did not use yet.

[Sequenzial]

(sorry I only have the german interface available in the pictures ...)

[ITTV-tools]

german is fine :) The changelog says there is support for this chip. I would compile it myself but I don’t know what to add it in „user_config_override“ for example. How have you done it ? Or wich firmware have you used ?

[Sequenzial]

Just remove the //
#define USE_PCF8574 // [I2cDriver2] Enable PCF8574 I/O Expander (I2C addresses 0x20 - 0x26 and 0x39 - 0x3F) (+1k9 code)

Then you can use it.

[Sequenzial]

https://github.com/arendst/Tasmota/wiki/Prerequisites
https://github.com/arendst/Tasmota/wiki/Hardware-preparation

I personally still use Arduino IDE, because I get usable results.

[Sequenzial]

--- > The changelog says there is support for this chip.
I assume the i2c protocoll can see a device, but if the firmware does not contain the correct driver, it won´t work.
You have to compile a firmware yourself or get an modified version somewhere.

[Sequenzial]

I have compiled the "basic 8.1" and enabled MCP230xx and PCF8574

tasmota_8.1_MCP230xx+PCF8574.zip

With 600 kb it is pretty big, so you need to flash an minimal firmware first.

[ITTV-tools]

thanks

[KostasHelsinki]

Hi guys, im experimenting with this but i found unreliable the operation. First, when esp8266 boots it briefly pulls high all pcf8574 pins high. Then, if i power on off a pin from webui or console, sometimes doesnt really do anything. My 3rd problem is that i cannot use the pins as inputs. Has any of you had these problems?

[alxferraz]

I am also interested in using some of the pins in PCF8574 as inputs. Any ideas?

[kumaran512]

Anybody please post how to use PCF8574 as input?

[snaiperr]

Dear All,
please share information how to check the state of PCF8574 as input

[1Ombree]

I have compiled the "basic 8.1" and enabled MCP230xx and PCF8574

tasmota_8.1_MCP230xx+PCF8574.zip

With 600 kb it is pretty big, so you need to flash an minimal firmware first.

Could you please confirm if I should first firmware the ESP with tasmota-minimal.bin (from i.e. http://thehackbox.org/tasmota/release/) and after that firmware with file from you?
Is it Ok to use first 8.5.0 (minimal) and that 8.1.0 (tasmota_8.1_MCP230xx+PCF8574)?

[Sequenzial]

Could you please confirm if I should first firmware the ESP with tasmota-minimal.bin (from i.e. http://thehackbox.org/tasmota/release/) and after that firmware with file from you?

yes, minimal first then the other one.

Is it Ok to use first 8.5.0 (minimal) and that 8.1.0 (tasmota_8.1_MCP230xx+PCF8574)?

I suggest you get and flash the minimal 8.1 and then flash the other 8.1 one.

Or: create a fresh image.
At all it is not too difficult to compile it yourself (eg. running on 8.5).
I am not a programmer and just followed the instructions on the wiki.
Then use the minimal 8.5 and your fresh compiled image.